SQL Query to find the server roles and the members of those roles.
use master
go
select sp_role.name,sp_mems.name, * from sys.server_role_members srm
left outer join sys.server_principals sp_role
on sp_role.principal_id = srm.role_principal_id
left outer join sys.server_principals sp_mems
on sp_mems.principal_id = srm.member_principal_id
select * from sys.server_role_members srm
select * from sys.server_principals